Our expert says:
A drug habit is an extremely expensive hobby. But if he is asaulting and stealing fro his grandmother, the police should be involved, and charges laid against him ( in jail there's a chance he might get some help to quit his drug habit ). If he is being victimized by other prisoners, complain to the authorities at the prison / police station and insist that they prevent this from happening --- but don't withdraw charges and let him return to his bad old ways, as that has high risks as well, for other people as well as for him.
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